Petehs



(No Model.) W. R. MIGHENER.

STRAW BURNING STEAM BOILBR.

Patented Feb.2o,1883.

-NVENTUE- N4 PETERS. Fhnlmmhognphnr, washington, D. c.

UNITED STATES PATENT OFFICE.

WILLIAM R. MIOHENER, OF OSWEGO, NEW YORK.

STRAW-BURNING STEAM-BOILER.

SPECIFICATION forming partV of Letters Patent No. 272,453, dated February 20, 1883. Application filed November 28, 1,882. (No model.)

.To all lwhom it may concern Be it known that I,WILLIAM B VMIGHENER, ofOswego, in the county ofOswego, in the State of' New York, have invented new and useful Improvements in Straw-Burning Steam-Boilers,of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to that class of steamv boilers which are denominated straw-burning boilers, and in which straw-stubble and similar light fuel is used for generating steam.

This invention consists in certain novel devices applied to the boiler for the purpose of rendering the same more secure' against communicating iire to surrounding objects and more efliclent in its operation, all as hereinafter more fully described, and specifically set forth in the claims.

The invention is fully illustrated in the annexed drawings, wherein Figure 1 is a vertical transverse section, taken through the front portion of the furnace and boiler, as indicated by dotted line g/ y in Fig. 2 of the drawings.

Fig. 2 is a longitudinal section of a steam` neath which is arranged the ash-pit It, -in thel usual manner. The opposite end of the flue B intersects the usual combustion'chamber, E, built on the rear end of the boiler, and from thence the products of combustion pass through the return-ilues it', extended through the boiler at opposite sides of the main iiue Bhand to the smoke-box F on the frontend of the boiler, from whence the products of combustion escape hrough the stack G, built upon said smolie- D represents a drum arranged vertically across the iiue B, near its junction with the upper end, c, blank or smooth and fitted loosel in the bottom ot' the drum. A nut, cl, on'the tube b, and a copper washer, e, between said nut and bottom of the drum, and pressing against the latter, secures the drum D in its position, said arrangement admitting of a ready removal of the drum D, when required for repairs or renewal, by running the nut d down the tube b. Then, by turning the drum so as to unscrew it from the nipple a, the drum can be lifted oft from the lower tube, b, and taken out of the flue B. ,The attachment of the drum is equally as readily accomplished.

From opposite sides of the drum D are eX- tended a series of branch pipes, a a, which are open to the interior of the drum, so as to becomecharged with water from the same. These branch pipes are placed so close to each other and extend to such proximity to the duc-shell as to form a barrier orv guard to prevent the cinders and imperfectly-consumed particles of fuel from passing into the tlue D and out of the stack of the boiler, thus preventing the clogging of the return-dues and other passages of the products of combustion through'the boiler, and also obviating the danger of communicatin g tire to surrounding objects.

Aside from the beforesta-ted benets derived from the drum D and its branch pipes c a, it is obvious that said arrangement serves to materially enhance the heating-surface of the boiler and to produceiperi'ect circulation of the heat from the bottom to the top ot' the boiler.

In order to obtain ready access to the interior ot the drum D and its connections with the boiler for cleaning the same, I provide the bottom of the boiler with a handhole, K, in

range with the tube b of the drum, as shown in Figs. 2 and 3 of the drawings. To furthery guard against setting tire to objects in the vicinity of the boiler l tap the water-space of the boiler by a pipe, l, provided with a suitroo able stop-cock, m, and extended into the ashpau h, preferably into the rear end thereof, and thence along the side of the same, as shown in Fig. 4 of the drawings, the end of said pipe being closed and the portion inside of the ash-pan being perforated to discharge the water into the ashesand cinders, and thus extinguish the sparks and cool the contents of the aslrpan. By tapping the boiler with the pipe I, at or near the water-line of the boiler, I malte said pipe serve the additional function of a surface-blower.

AM represents the feed-door, through which to introduce the straw and other light fuel into the fire-box H, said feed-door being usually arranged near the upper portion of the lire-box and provided with a self-closingdoor, N, to permit ot' properly and safely applying the said fuel to the fire-box. Underneath this feed-door M, I provide the lire-box with a supplemental lire-door, L, as shown in Fig. 2 of the drawings. This latter door affords ready access to the grate for cleaning the re, and also serres as a feed-door for the introduction of wood or coal, thus adapting the boiler for the latter fuel as well as straw or other light fuel.

Having described my invcntion,what[claim as new, and desire to secure by Letters Patent, is-

In combination with the boiler A and the fire-'due B, extended horizontally through the water-space of the boiler, as shown, the drum D, arranged across said Iiue and communicating at opposite ends with the interior of the boiler, and the brauch pipes a a, projecting from opposite sides of the drum across theinA terior ot' the flue, substantially in the manner described aud showu,for the purpose set forth.

In testimony whereof I have hereunto Signed my name and aixed my seal, in the presence ot' two attestiug witnesses, at Syracuse,in the county of Onondaga, in the State ot' New York, this 21st day of November, 1882.

WILLIAM R. M IGHENER.

Witnesses:

WM. C. RAYMOND, FREDERICK H. GlBBs. 

